CN111656726A - Multi-Carrier Preemption Indicator - Google Patents

Abstract

Methods, systems, devices, and apparatuses for wireless communication are disclosed. In one aspect, a base station multiplexes services on shared channel resources in a pre-emptive manner. A base station may send one or more control messages with multi-carrier preemption information to User Equipment (UE) devices that may be affected by preemption. The preemption information can relate to a primary component carrier and one or more secondary component carriers designated for the UE. In some aspects, the control message may include an indication of availability of preemption information for each of a plurality of carriers, and may also include variable size preemption information identifiable for the plurality of carriers based on a subset of carriers for which the preemption information is indicated as being available. The UEs may adjust the manner in which they send or receive data transmissions based on the preemption information. Additional aspects, embodiments, and features are described and claimed.

Description

Multi-Carrier Preemption Indicator

Background technique

priority claim

This patent application claims Provisional Application No. 62/625,844, filed Feb. 2, 2018, entitled "MULTI-CARRIER PREEMPTIONINDICATOR," and filed Jan. 30, 2019, entitled "MULTI-CARRIER PREEMPTIONINDICATOR." - Priority to Non-Provisional Application No. 16/262,605 to CARRIER PREEMPTION INDICATOR", which is assigned to the assignee of the present application and is hereby expressly incorporated herein by reference.

technical field

The following relates generally to wireless communications, and more particularly to systems, methods, and devices that support preemption-based multiplexing.

introduction

Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcast, and the like. These systems may be able to support communication with multiple users by sharing the available system resources (eg, time, frequency, and power). Examples of such multiple-access systems include fourth generation (4G) systems, such as Long Term Evolution (LTE) systems or LTE-Advanced (LTE-A) systems, and fifth generation, which may also be referred to as New Radio (NR) systems (5G) system. These systems may employ multiple access techniques such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), or Discrete Fourier Transform Spread OFDM (DFT) -S-OFDM). A wireless multiple-access communication system may include several base stations or network access nodes, each base station or network access node supporting communication for a plurality of communication devices, which may otherwise be referred to as user equipment (UE).

The various multiple-access communication systems above have been specified in telecommunications standards to provide common protocols that enable different wireless devices to communicate. An example of an evolved telecommunication standard is 5G New Radio. 5G New Radio is being promulgated by the 3rd Generation Partnership Project (3GPP) to meet new requirements associated with latency, reliability, security, and scalability (eg, with the Internet of Things (IoT)). In an environment where different types of services are provided and different requirements must be met at the same time, there is a need for constant innovation. The techniques described herein are broadly applicable to multiple-access techniques in which preemption-based scheduling for different traffic types is supported and the corresponding telecommunication standards for these multiple-access techniques.

Overview

The described techniques generally relate to improved methods, systems, and apparatus for supporting preemption-based multiplexing in a multi-carrier environment. In one particular aspect, the described techniques may be applied to pre-emption of enhanced mobile broadband (eMBB) transmissions by ultra-reliable low-latency communications (URLLC) transmissions, and control signaling associated with such pre-emption.

A method of wireless communication performed by a user equipment (UE) is described. The method may include receiving a control message in a downlink control channel, the control message including an indication of the availability of preemption information for a plurality of carriers, and determining whether the plurality of carriers includes the UE being scheduled to transmit on or at least one carrier for receiving data transmissions. The method may include identifying pre-emption information for the at least one carrier in variable-size pre-emption information based on a subset of carriers in the plurality of carriers for which pre-emption information is indicated as available, and based on resources for scheduled data transmission and A base station is communicated on the at least one carrier based on the preemption information.

A user equipment is described. The UE may include means for receiving a control message in a downlink control channel, the control message including an indication of the availability of preemption information for a plurality of carriers, and for determining whether the plurality of carriers includes the UE being scheduled A device that forms at least one carrier on which data transmissions are sent or received. The apparatus may also include means for identifying pre-emption information for the at least one carrier in variable-size pre-emption information based on a subset of carriers in the plurality of carriers for which pre-emption information is indicated as available, and for identifying pre-emption information for the at least one carrier based on pre-emption information for A device that schedules resources for data transmission and communicates with a base station on the at least one carrier based on the preemption information.

Another apparatus for wireless communication is described. The apparatus may include a processor, memory in electronic communication with the processor, and instructions stored in the memory. The instructions are operable to, when executed by the processor, cause the apparatus to: receive a control message in a downlink control channel, the control message including an indication of the availability of preemption information for a plurality of carriers, and determine the plurality of Whether the carrier includes at least one carrier on which the apparatus is scheduled to send or receive data transmissions. The instructions are further operable to, when executed by the processor, cause the apparatus to: identify a pre-emption for the at least one carrier in variable-sized pre-emption information based on a subset of carriers in the plurality of carriers for which pre-emption information is indicated as available information, and communicating with the base station on the at least one carrier based on the resources for the scheduled data transmission and based on the preemption information.

A non-transitory computer readable medium storing code for wireless communication is described. The code may include instructions executable by the processor to receive a control message in a downlink control channel, the control message including an indication of the availability of preemption information for the plurality of carriers, and

It is determined whether the plurality of carriers includes at least one carrier on which the apparatus is scheduled to send or receive data transmissions. The code may also include instructions executable by the processor for identifying pre-emption information for the at least one carrier in variable-size pre-emption information based on a subset of carriers in the plurality of carriers for which pre-emption information is indicated as available, and communicating with the base station on the at least one carrier based on the resources for the scheduled data transmission and based on the preemption information.

Some examples of the above-described methods, apparatus (apparatus), and non-transitory computer-readable media may include operations, features, means, or instructions for: wherein the location of preemption information for at least one carrier is based on a plurality of carriers The pre-emption information is indicated to vary for the available subset of carriers. Additionally, the operations, features, apparatus or instructions described herein may include the UE determining a mapping between bits of a control message including an indication of availability of preemption information and a corresponding carrier index in the UE's carrier aggregation configuration, such that determining whether the plurality of carriers includes at least one carrier on which the UE is scheduled to send or receive data transmissions is based at least in part on the mapping. In some aspects, the indication of availability of preemption information includes a first field of the control message having a fixed size, and wherein the variable size preemption information includes a second field of the control message having a variable size. In other aspects, the UE is operable to identify, based on the preemption information, a subset of resources that are unavailable among the resources on which the UE is scheduled to send or receive data transmissions.

A method of wireless communication performed by a base station is described. The method may include: identifying one or more carriers of the plurality of carriers for which preemption information is available; and generating an indication of the availability of preemption information for each carrier in the plurality of carriers based on a corresponding index value for the carrier. The method may further include generating a control message including an indication of availability of preemption information and variable size preemption information, wherein the preemption information for a carrier of the plurality of carriers is at the variable size based on the indication The preemption information is identifiable. The method may also include transmitting the control message to a group of user equipment devices on a downlink control channel.

An apparatus for wireless communication is described. The apparatus may include: means for generating an indication of the availability of preemption information for each carrier in a plurality of carriers based on a corresponding index value for the carrier; means for generating a control message, the control message including the preemption information An indication of availability of information and variable size preemption information, wherein preemption information for a carrier of the plurality of carriers is identifiable within the variable size preemption information based on the indication. The apparatus may include means for transmitting the control message to a group of user equipment devices on a downlink control channel.

Another apparatus for wireless communication is described. The apparatus may include a processor, memory in electronic communication with the processor, and instructions stored in the memory. The instructions are operable to, when executed by the processor, cause the apparatus to: identify one or more carriers of the plurality of carriers for which preemption information is available; and generate a pair based on a corresponding index value for each carrier of the plurality of carriers An indication of the availability of preemption information for this carrier. The instructions are further operable to, when executed by the processor, cause the apparatus to: generate a control message including an indication of availability of pre-emption information and variable-size pre-emption information, wherein for a carrier of the plurality of carriers The preemption information for is identifiable within the variable size preemption information based on the indication; and the control message is communicated to a group of user equipment devices on a downlink control channel.

A non-transitory computer readable medium storing code for wireless communication is described. The code may include instructions executable by the processor to: identify one or more carriers of the plurality of carriers for which preemption information is available; and generate a pair based on a corresponding index value for each carrier of the plurality of carriers An indication of the availability of preemption information for this carrier. The code may include instructions executable by the processor to generate a control message including an indication of availability of preemption information and variable size preemption information, wherein the control message for a carrier of the plurality of carriers The preemption information is identifiable within the variable size preemption information based on the indication; and the control message is communicated to a group of user equipment devices on a downlink control channel.

Brief Description of Drawings

1 illustrates an example system for supporting pre-emption-based multiplexing wireless communications in accordance with aspects of the present disclosure.

Figure 2 shows an example of preemption based multiplexing for URLLC and eMBB communications.

3 illustrates an exemplary call flow in which multi-carrier preemption information is utilized in accordance with aspects of the present disclosure.

4 illustrates an example control message that provides multi-carrier preemption information in accordance with aspects of the present disclosure.

5 illustrates a block diagram of a device supporting preemption-based multiplexing in accordance with aspects of the present disclosure.

6 illustrates a method for performing wireless communication by user equipment in accordance with aspects of the present disclosure.

7 illustrates a block diagram of a device supporting preemption-based multiplexing in accordance with aspects of the present disclosure.

8 illustrates a method for performing wireless communication by a base station in accordance with aspects of the present disclosure.

Detailed Description

As described herein, Ultra Reliable Low Latency Traffic (URLLC) and Enhanced Mobile Broadband (eMBB) traffic may be multiplexed in a wireless communication system. In some cases, URLLC traffic may preempt or puncture resources occupied by, for example, ongoing eMBB communications. This may occur when the eMBB device has been assigned or granted specific airlink resources for communication and the use of those resources is preempted by URLLC traffic. This pre-emption may take the form of puncturing a portion of the shared channel resources scheduled for eMBB communication with URLLC data. For example, URLLC communications may replace part of the eMBB data of ongoing eMBB communications.

Since the puncturer URLLC communication is not part of the eMBB communication, decoding errors will result if the eMBB device attempts to process it. Accordingly, some devices (eg, base stations or UEs) may send pre-emption information for URLLC transmissions indicating that URLLC data is being sent on certain shared channel resources that may have been allocated for eMBB traffic. Other devices (eg, UEs or base stations) may receive pre-emption information indicating that URLLC data is being sent on a particular shared channel resource and may puncture or preempt eMBB communications.

As the use of additional component carriers for communications between the UE and the base station continues to grow, the probability of preemption increases with the amount of preemption information that must be communicated to inform eMBB devices that may be affected by URLLC communications. The present disclosure provides innovative techniques for signaling preemption information for multiple carriers. The preemption information may be arranged in the control message such that the size of the preemption information may vary while the carrier to which the preemption information applies remains identifiable. In some aspects, control messages can be sent in different parts and can be co-addressed to a group of user equipment.

Aspects of the present disclosure were originally described in the context of a wireless communication system. Aspects of the present disclosure are further illustrated and described by and with reference to the following apparatus diagrams, system diagrams, and flow diagrams related to providing preemption information in one or more control messages. Although examples of URLLC and eMBB services may be provided herein, it will be understood that the present disclosure is not limited to a particular type of communication, but is broadly applicable to preemption-based multiplexing in wireless communication systems.

Those skilled in the art will appreciate that additional implementations and use cases may arise and that the innovations described herein may be implemented across different platforms, devices, systems, shapes, sizes, and packaging arrangements. For example, various embodiments and/or uses may be implemented via integrated chip embodiments and other non-modular component-based devices (eg, end-user equipment, vehicles, communications equipment, computing equipment, industrial equipment, retail/shopping equipment, medical equipment, AI-enabled devices, etc.) to generate. While some examples may or may not be specific to each use case or particular application, broad applicability of the described innovations is envisioned. Implementations may range from chip-scale or modular components to non-module, non-chip-scale implementations, and further to aggregated, distributed or OEM devices or systems incorporating one or more aspects of the described innovations. In some practical settings, devices incorporating the described aspects and features may also necessarily include additional components and features for implementing and practicing the claimed and described embodiments. For example, the transmission and reception of wireless signals must include several components for both analog and digital purposes (eg, hardware components including antennas, RF chains, power amplifiers, modulators, buffers, filters, processor(s), interleaver, adder/summer, etc.). The innovations described herein are intended to be practiced in a wide variety of devices, chip-scale components, systems, distributed arrangements, end-user equipment, and the like, of various sizes, shapes, and configurations.

1 illustrates an example of a wireless communication system 100 that supports preemption information in accordance with aspects of the present disclosure. Wireless communication system 100 includes base station 105 , UE 115 and core network 130 . In some examples, wireless communication system 100 may be a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A) network, or a New Radio (NR) network. In some cases, the wireless communication system 100 may support enhanced broadband communication, ultra-reliable (eg, mission critical) communication, low latency communication, or communication with low cost and low complexity devices.

Base station 105 may wirelessly communicate with UE 115 via one or more base station antennas. The base stations 105 described herein may include or may be referred to by those skilled in the art as a base transceiver station, radio base station, access point, radio transceiver, Node B, evolved Node B (eNB), next generation Node B, or Gigabit Node B (any of which may be referred to as a gNB), home Node B, home evolved Node B, or some other suitable term. The wireless communication system 100 may include different types of base stations 105 (eg, macro base stations or small cell base stations). The UEs 115 described herein may be capable of communicating with various types of base stations 105 and network equipment, including macro eNBs, small cell eNBs, gNBs, relay base stations, and the like.

Each base station 105 may be associated with a particular geographic coverage area 110 in which communication with various UEs 115 is supported. Each base station 105 may provide communication coverage for a respective geographic coverage area 110 via a communication link 125, and the communication link 125 between the base station 105 and the UE 115 may utilize one or more carriers. The communication link 125 shown in the wireless communication system 100 may include uplink transmissions from the UE 115 to the base station 105 or downlink transmission from the base station 105 to the UE 115 . Downlink transmissions may also be referred to as forward link transmissions, and uplink transmissions may also be referred to as reverse link transmissions.

The geographic coverage area 110 of the base station 105 may be divided into sectors that form only a portion of the geographic coverage area 110, and each sector may be associated with a cell. For example, each base station 105 may provide communication coverage for macro cells, small cells, hotspots, or other types of cells, or various combinations thereof. In some examples, the base stations 105 may be mobile and thus provide communication coverage over the mobile geographic coverage area 110 . In some examples, different geographic coverage areas 110 associated with different technologies may overlap, and overlapping geographic coverage areas 110 associated with different technologies may be supported by the same base station 105 or different base stations 105 . The wireless communication system 100 may include, for example, a heterogeneous LTE/LTE-A, or NR network, where different types of base stations 105 provide coverage for various geographic coverage areas 110 .

The term "cell" refers to a logical communication entity used to communicate with base station 105 (eg, on a carrier) and may be associated with an identifier to distinguish adjacent cells (eg, physical cells) operating via the same or different carriers Cell Identifier (PCID), Virtual Cell Identifier (VCID)). In some examples, base station 105 may support multiple cells and may be based on different protocol types (eg, Machine Type Communication (MTC), Narrowband Internet of Things (NB-IoT), enhanced mobile broadband (eMBB) or others) to configure different cells. In some cases, the term "cell" may refer to a portion (eg, a sector) of a geographic coverage area 110 over which a logical entity operates.

The various UEs 115 may be dispersed throughout the wireless communication system 100, and each UE 115 may be stationary or mobile. UE 115 may also be referred to as a mobile device, wireless device, remote device, handheld device, or subscriber device, or some other suitable terminology, where "device" may also be referred to as a unit, station, terminal, or client. UE 115 may also be a personal electronic device, such as a cellular telephone, personal digital assistant (PDA), tablet computer, laptop computer, or personal computer. In some examples, UE 115 may also refer to a wireless local loop (WLL) station, Internet of Things (IoT) device, Internet of Everything (IoE) device, or MTC device, etc., which may be implemented in various items such as appliances , vehicles, instruments, etc.).

Some UEs 115, such as MTC or IoT devices, may be low-cost or low-complexity devices and may provide automated communication between machines (eg, via machine-to-machine (M2M) communication). M2M communication or MTC may refer to a data communication technology that allows devices to communicate with each other or with the base station 105 without human intervention. In some examples, M2M communications or MTC can include communications from devices that integrate sensors or meters to measure or capture information and relay the information to a central server or application that can utilize the information Or present that information to a person interacting with the program or application. Some UEs 115 may be designed to collect information or implement automated actions by machines. Examples of applications for MTC devices include: smart metering, inventory monitoring, water level monitoring, equipment monitoring, health care monitoring, field survival monitoring, weather and geographic event monitoring, queue management and tracking, remote security sensing, physical access control , and transaction-based commercial charges.

Some UEs 115 may be configured to employ a reduced power consumption mode of operation, such as half-duplex communication (eg, a mode that supports unidirectional communication via transmit or receive but not simultaneous transmit and receive). In some examples, half-duplex communication may be performed at a reduced peak rate. Other power saving techniques for the UE 115 include entering a power saving "deep sleep" mode when not engaged in active communications, or operating on limited bandwidth (eg, from narrowband communications). In some cases, UE 115 may be designed to support critical functions (eg, mission critical functions), and wireless communication system 100 may be configured to provide ultra-reliable communications for these functions.

In some cases, UEs 115 may also be able to communicate directly with other UEs 115 (eg, using peer-to-peer (P2P) or device-to-device (D2D) protocols). One or more UEs in a group of UEs 115 utilizing D2D communication may be within the geographic coverage area 110 of the base station 105 . Other UEs 115 in the group may be outside the geographic coverage area 110 of the base station 105 or otherwise be unable to receive transmissions from the base station 105 . In some cases, groups of UEs 115 communicating via D2D communication may utilize a one-to-many (1:M) system, with each UE 115 transmitting to every other UE 115 in the group. In some cases, the base station 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication is performed between UEs 115 without involving base station 105 .

The base stations 105 may communicate with the core network 130 and with each other. For example, base station 105 may interface with core network 130 through backhaul link 132 (eg, via S1 or other interface). Base stations 105 may communicate with each other directly (eg, directly between base stations 105) or indirectly (eg, via core network 130) over backhaul links 134 (eg, via an X2 or other interface).

Core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an Evolved Packet Core (EPC), and the EPC may include at least one Mobility Management Entity (MME), at least one Serving Gateway (S-GW), and at least one Packet Data Network (PDN) Gateway (P-GW) ). The MME may manage non-access stratum (eg, control plane) functions such as mobility, authentication, and bearer management for UEs 115 served by base stations 105 associated with the EPC. User IP packets may be passed through the S-GW, which itself may be connected to the P-GW. The P-GW may provide IP address assignment and other functions. The P-GW can be connected to network operator IP services. Operator IP services may include access to the Internet, intranet(s), IP Multimedia Subsystem (IMS), or Packet Switched (PS) streaming services.

At least some network equipment, such as base station 105, may include subcomponents, such as access network entities, which may be examples of access node controllers (ANCs). Each access network entity may communicate with each UE 115 through several other access network transport entities, which may be referred to as radio heads, intelligent radio heads, or transmit/receive points ( TRP). In some configurations, the various functions of each access network entity or base station 105 may be distributed across various network devices (eg, radio heads and access network controllers) or consolidated into a single network device (eg, base station 105 ) )middle.

Wireless communication system 100 may operate using one or more frequency bands, typically in the range of 300MHz to 300GHz. In general, the 300MHz to 3GHz division is referred to as an ultra high frequency (UHF) division or decimeter band because wavelengths range from about 1 decimeter to 1 meter long. UHF waves can be blocked or redirected by buildings and environmental features. However, these waves may penetrate various structures sufficiently for macro cells to provide service to UEs 115 located indoors. Transmission of UHF waves is comparable to transmission of smaller antennas and shorter ranges (eg, less than 100km) associated.

The wireless communication system 100 may also operate in the very high frequency (SHF) region using the frequency band from 3 GHz to 30 GHz (also referred to as the centimeter frequency band). The SHF zone includes frequency bands that may be opportunistically used by devices that can tolerate interference from other users (such as the 5 GHz Industrial, Scientific and Medical (ISM) frequency band).

The wireless communication system 100 may also operate in the extremely high frequency (EHF) region of the spectrum (eg, from 30 GHz to 300 GHz), also referred to as the millimeter frequency band. In some examples, wireless communication system 100 may support millimeter wave (mmW) communication between UE 115 and base station 105, and the EHF antennas of the respective devices may be even smaller and more closely spaced than UHF antennas. In some cases, this may facilitate the use of antenna arrays within UE 115 (eg, for multiple-input multiple-output (MIMO) operations such as spatial multiplexing, or for directional beamforming). However, propagation of EHF transmissions may experience even greater atmospheric attenuation and shorter range than SHF or UHF transmissions. The techniques disclosed herein may be employed across transmissions using one or more different frequency partitions, and the designated use of frequency bands across these frequency partitions may vary from country to country or regulatory agency.

In some cases, wireless communication system 100 may utilize both licensed and unlicensed radio spectrum bands. For example, wireless communication system 100 may employ LTE License Assisted Access (LTE-LAA), or LTE Unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed frequency band, such as the 5GHz ISM band. When operating in an unlicensed radio spectrum band, wireless devices such as base station 105 and UE 115 may employ listen-before-talk (LBT) procedures to ensure that frequency channels are clear before transmitting data. In some cases, operation in unlicensed bands may be based on CA configuration in conjunction with CCs operating in licensed bands. Operations in the unlicensed spectrum may include downlink transmissions, uplink transmissions, peer-to-peer transmissions, or a combination of these. Duplexing in the unlicensed spectrum may be based on frequency division duplexing (FDD), time division duplexing (TDD), or a combination of the two.

In some cases, the antennas of the base station 105 or UE 115 may be located within one or more antennas or antenna arrays that may support MIMO operation, such as spatial multiplexing, or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly such as an antenna tower. In some cases, the antennas or antenna arrays associated with base station 105 may be located in different geographic locations. The base station 105 may have an antenna array with several rows and columns of antenna ports that the base station 105 may use to support beamforming of communications with the UE 115 . Likewise, UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations.

A MIMO wireless system uses a transmission scheme between a transmitter device (eg, base station 105) and a receiver device (eg, UE 115), both of which are equipped with multiple antennas. MIMO communications may employ multipath signal propagation to increase utilization of radio frequency bands by transmitting or receiving different signals via different spatial paths (which may be referred to as spatial multiplexing). For example, the transmitting device may transmit different signals via different antennas or different combinations of antennas. Likewise, recipient devices may receive different signals via different antennas or different combinations of antennas. Each of the different signals may be referred to as separate spatial streams, and different antennas or different combinations of antennas at a given device (eg, the device's orthogonal resources associated with spatial dimensions) may be considered to support different space layer.

Beamforming (also referred to as spatial filtering, directional transmission, or directional reception) is a signal processing technique that can be used at a transmitting device or a receiving device (eg, base station 105 or UE 115) to communicate along the The direction between receiver devices shapes or steers the antenna beam (eg, transmit beam or receive beam). Beamforming can be achieved by combining signals communicated via the antenna elements of an antenna array such that signals propagating in a particular orientation relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to signals communicated via the antenna elements may include the transmitting or receiving device applying specific phase shifts, timing advance/delays, or amplitude adjustments to the signals carried via each antenna element associated with the device. The adjustments associated with each antenna element may be defined by a set of beamforming weights associated with a particular orientation (eg, relative to the antenna array of the transmitting or receiving device, or relative to some other orientation).

In one example, base station 105 may use multiple antennas or antenna arrays for beamforming operations for directional communication with UE 115 . For example, a signal may be transmitted multiple times in different directions, which may include the signal being transmitted according to different sets of beamforming weights associated with different transmission directions. A receiver device (eg, UE 115, which may be an example of a mmW receiver device) may attempt multiple receive beams when receiving various signals from base station 105, such as synchronization signals, or other control signals. For example, the receiving device may attempt multiple reception directions by receiving via different antenna sub-arrays, processing the received signal according to the different antenna sub-arrays, according to the received signal applied at the multiple antenna elements of the antenna array A signal is received or processed according to a different set of receive beamforming weights applied to signals received at multiple antenna elements of an antenna array, any of which may be referred to as according to "Listening" to different receive beams or receive directions.

In some cases, wireless communication system 100 may be a packet-based network operating according to a layered protocol stack. In the user plane, communication at the bearer or Packet Data Convergence Protocol (PDCP) layer may be IP based. In some cases, the Radio Link Control (RLC) layer may perform packet segmentation and reassembly to communicate on logical channels. The Medium Access Control (MAC) layer may perform prioritization and multiplexing of logical channels into transport channels. The MAC layer may also use Hybrid Automatic Repeat Request (HARQ) to provide retransmissions at the MAC layer, thereby improving link efficiency. In the control plane, the Radio Resource Control (RRC) protocol layer may provide the establishment, configuration and maintenance of RRC connections between UE 115 and base station 105 or core network 130 supporting radio bearers for user plane data. At the physical (PHY) layer, transport channels can be mapped to physical channels.

In some cases, UE 115 and base station 105 may support retransmission of data to increase the likelihood that the data will be successfully received. HARQ feedback is a technique that increases the likelihood that data will be received correctly over the communication link 125 . HARQ may include a combination of error detection (eg, using a cyclic redundancy check (CRC)), forward error correction (FEC), and retransmission (eg, automatic repeat request (ARQ)). HARQ can improve throughput at the MAC layer in poor radio conditions (eg, signal-to-noise ratio conditions). In some cases, a wireless device may support timeslot HARQ feedback, where the device may provide HARQ feedback in a particular timeslot for data received in previous symbols in that timeslot. In other cases, the device may provide HARQ feedback in subsequent time slots or according to some other time interval.

A time interval in LTE or NR may be expressed in multiples of the basic time unit (which may for example refer to the sampling period _Ts = 1/30,720,000 seconds). The time intervals of the communication resources may be organized according to radio frames each having a duration of 10 milliseconds (Tf=307200*Ts). A radio frame may be identified by a system frame number (SFN) ranging from 0 to 1023. Each frame may include 10 subframes numbered from 0 to 9, and each subframe may have a duration of 1 millisecond. The subframe may be further divided into 2 slots each having a duration of 0.5 milliseconds, and each slot may contain 6 or 7 modulation symbol periods (eg, depending on the length of the cyclic prefix added before each symbol period) ). Excluding the cyclic prefix, each symbol period may contain 2048 sample periods. In some cases, a subframe may be the smallest scheduling unit of the wireless communication system 100 and may be referred to as a transmission time interval (TTI). In other cases, the smallest scheduling unit of wireless communication system 100 may be shorter than a subframe or may be dynamically selected (eg, in a shortened TTI (sTTI) burst or in selected component carriers using sTTI).

In some wireless communication systems, a time slot may be further divided into a plurality of mini-slots containing one or more symbols, and in some instances the symbols of the mini-slot or the mini-slot itself may be the minimum schedule unit. For example, each symbol may vary in duration depending on the subcarrier spacing or operating frequency band. Some wireless communication systems may implement timeslot aggregation, where multiple timeslots or mini-slots may be grouped together for communication between UE 115 and base station 105 .

A resource element may include one symbol period (eg, duration of one modulation symbol) and one subcarrier (eg, 15 kHz frequency range). A resource block may contain 12 consecutive subcarriers in the frequency domain and 7 in the time domain (1 slot) for a normal cyclic prefix in each Orthogonal Frequency Division Multiplexing (OFDM) symbol Consecutive OFDM symbol periods, or ie, contain a total of 84 resource elements across the frequency and time domains. The number of bits carried by each resource element may depend on the modulation scheme (modulation symbol configuration that may be applied during each symbol period). Thus, the more resource elements UE 115 receives and the higher the modulation scheme (eg, the more bits that can be represented by modulation symbols according to a given modulation scheme), the higher the data rate for UE 115 can be. In a MIMO system, wireless communication resources may refer to a combination of radio spectral band resources, time resources, and spatial resources (eg, spatial layers), and the use of multiple spatial layers may further increase the data rate of communications with UE 115 .

The term "carrier" refers to a set of radio frequency spectrum resources that has a defined organizational structure for supporting uplink or downlink communications over communication link 125 . For example, a carrier of communication link 125 may comprise a portion of a radio frequency band (also referred to as a frequency channel). In some examples, a carrier wave may consist of multiple sub-carriers (eg, multiple waveform signals of different frequencies). A carrier may be organized to include multiple physical channels, where each physical channel may carry user data, control information, or other signaling.

The organization of the carriers may be different for different radio access technologies (eg, LTE, LTE-A, NR, etc.). For example, communications on a carrier may be organized according to TTIs or time slots, each of which may include user data and control information or signaling to support decoding the user data. The carrier may also include dedicated acquisition signaling (eg, synchronization signals or system information, etc.) and control signaling to coordinate the operation of the carrier. In some examples (eg, in a carrier aggregation configuration), a carrier may also have acquisition signaling or control signaling that coordinates the operation of other carriers.

Physical channels may be multiplexed on the carriers according to various techniques. The physical control channels and physical data channels may be multiplexed on the downlink carrier, eg, using time division multiplexing (TDM) techniques, frequency division multiplexing (FDM) techniques, or hybrid TDM-FDM techniques. In some examples, the control information communicated in the physical control channel may be distributed among different control regions in a concatenated manner (eg, in a common control region or common search space and one or more UE-specific control regions or between UE-specific search spaces).

A carrier may be associated with a particular bandwidth of the radio frequency spectrum, and in some examples, this carrier bandwidth may be referred to as the carrier or the "system bandwidth" of the wireless communication system 100 . For example, the carrier bandwidth may be one of several predetermined bandwidths (eg, 1.4, 3, 5, 10, 15, or 20 MHz) of a carrier for a particular radio access technology. In some examples, system bandwidth may refer to the smallest unit of bandwidth used to schedule communications between base station 105 and UE 115 . In other examples, the base station 105 or the UE 115 may also support communication on a carrier having a smaller bandwidth than the system bandwidth. In such examples, the system bandwidth may be referred to as a "broadband" bandwidth, and the smaller bandwidth may be referred to as a "narrowband" bandwidth. In some examples of the wireless communication system 100, wideband communication may be performed according to a 20MHz carrier bandwidth, and narrowband communication may be performed according to a 1.4MHz carrier bandwidth.

Devices of wireless communication system 100 (eg, base station 105 or UE 115) may have hardware configurations to support communication over a particular carrier bandwidth, or may be configurable to support communication over one carrier bandwidth in a set of carrier bandwidths. For example, base station 105 or UE 115 may perform some communications (eg, wideband communications) according to system bandwidth, and may perform some communications (eg, narrowband communications) according to smaller bandwidths. In some examples, wireless communication system 100 can include base station 105 and/or UE 115 that can support simultaneous communication via carriers associated with more than one different bandwidth.

Wireless communication system 100 may support communication with UE 115 over multiple cells or carriers, a feature that may be referred to as carrier aggregation (CA) or multi-carrier operation. The UE 115 may be configured with multiple downlink CCs and one or more uplink CCs according to the carrier aggregation configuration. Carrier aggregation can be used with both FDD and TDD component carriers.

In some cases, wireless communication system 100 may utilize enhanced component carriers (eCCs). The eCC may be characterized by one or more characteristics including wider carrier or frequency channel bandwidth, shorter symbol duration, shorter TTI duration, or modified control channel configuration. In some cases, the eCC may be associated with a carrier aggregation configuration or dual connectivity configuration (eg, when multiple serving cells have sub-optimal or non-ideal backhaul links). The eCC may also be configured for use in unlicensed or shared spectrum (eg, where more than one operator is permitted to use the spectrum). An eCC characterized by a wide carrier bandwidth may include one or more segments that may be utilized by UEs 115 that are not capable of monitoring the entire carrier bandwidth, or otherwise configured to use limited carrier bandwidth (eg, to conserve power).

In some cases, the eCC may utilize a different symbol duration than the other CCs, which may include using a reduced symbol duration compared to the symbol durations of the other CCs. Shorter symbol durations may be associated with increased spacing between adjacent subcarriers. Devices utilizing eCC, such as UE 115 or base station 105, may transmit wideband signals (eg, according to frequency channels or carrier bandwidths of 20, 40, 60, 80 MHz, etc.) with reduced symbol duration (eg, 16.67 microseconds) . A TTI in an eCC may include one or more symbol periods. In some cases, the TTI duration (ie, the number of symbol periods in a TTI) may be variable.

Wireless communication systems, such as NR systems, may use a combination of licensed, shared, and unlicensed frequency bands, among others. The flexibility of eCC symbol duration and subcarrier spacing may allow eCC to be used across multiple spectrums. In some examples, NR shared spectrum may increase spectrum utilization and spectrum efficiency, particularly through dynamic vertical (eg, across frequency) and horizontal (eg, across time) sharing of resources.

Figure 2 shows an exemplary multiplexing of URLLC and eMBB communications. In this example, time slot 200 includes a physical downlink control channel (PDCCH) 210, a physical downlink shared channel (PDSCH) 204, and an uplink short burst (ULSB) 212 portion. The PDCCH 210 may be transmitted by the base station 105 and may carry control messages for UEs 115 served by the base station 105 . Control messages may be unicast, or dedicated to a single UE, or they may be common to a group of UEs (group common control messages). The ULSB 212 portion of the slot 200 may be used by the UE 115 to transmit in the uplink direction and may be separated from the PDSCH 204 by a guard band.

As shown, PDSCH 204 carries eMBB traffic 202 . In this example, eMBB traffic 202 spans the duration of PDSCH 204 and may, for example, represent ongoing eMBB communications between base station 105 and one or more UEs 115, or it may represent a slot-based allocation of PDSCH 204 resources collection. In some examples, PDSCH resources for eMBB traffic 202 include a number of resource blocks (RBs), which may be indexed within PDSCH 204 and assigned for use by UE 115 . When a base station 105 identifies URLLC data for downlink transmission, the base station 105 may puncture eMBB traffic 202 with URLLC data 206, or otherwise preempt eMBB data, or reassign eMBB traffic resources for URLLC traffic 206 use. As shown, URLLC traffic 206 may occupy only a small set of resources on PDSCH 204, such as mini-slots. From the perspective of the UE 115 receiving the eMBB traffic 202, a portion of the UE 115's assigned resources do not represent eMBB data, and thus would result in decoding errors if not accounted for in the decoding process. Similarly, considerations apply in the uplink direction, where a UE 115 may modify transmissions by the UE 115 on the Physical Uplink Shared Channel (PUSCH) based on identifying resources that are reassigned for use by URLLC traffic.

As will be appreciated, time slot 200 may represent one time slot on each of a plurality of component carriers in a carrier aggregation configuration of UE 115 . In a carrier aggregation scenario, preemption based multiplexing can affect different component carriers at different times. This in turn may complicate the decoding process for the UE 115 and increase the amount of information that may be required to correctly decode transmissions on its primary component carrier and each of its secondary component carriers. The present disclosure provides control signaling that can be used to communicate preemption information for multiple carriers in an efficient manner. In some aspects, as described herein, efficiency is improved through the use of cross-carrier signaling and control formats that are accommodating while ensuring that preemption information remains identifiable for affected carriers Variable size preempts information.

3 illustrates an exemplary call flow 300 in which multi-carrier preemption information is utilized in accordance with aspects of the present disclosure. This example illustrates downlink operation where UE 115 may adjust its decoding behavior in relation to downlink data transmission based on preemption information received in control messages. It will be appreciated that uplink operation is also contemplated and within the scope of the present disclosure. Specifically, UE 115 may receive uplink grants for shared channel data transmission and may adjust its coding behavior based on preemption information conveyed in control messages. The techniques disclosed herein can be used in either link direction.

At block 305, the UE 115 is configured with one or more carriers. Each carrier in its configured set of carriers may be indexed at the UE 115 . In some aspects, a primary component carrier (PCC) is assigned an index of "0" and each secondary component carrier (SCC) is assigned a non-zero index value. The PCC may carry control information for the PCC, as well as cross-carrier control for one or more SCCs. In some aspects, each SCC may be self-scheduled and/or each SCC may be scheduled by other SCCs. Self-scheduling and cross-carrier scheduling may indicate the type of control messages monitored on each carrier, and these control messages may include unicast or group-shared control messages that carry preemption information as described herein.

At block 310, the base station 105 schedules eMBB traffic on the air link resources. This may include, for example, the slot-based arrangement shown in Figure 2, where eMBB traffic and URLCC traffic are multiplexed on PDSCH resources. At block 315, the base station 105 may identify one or more carriers of the plurality of carriers for which preemption information is available. Due to strict latency requirements, URLLC traffic may preempt previously scheduled eMBB transmissions. In some aspects, base station 105 punctures PDSCH resources assigned to eMBB traffic with URLLC data. Such puncturing/pre-emption may occur for each of several cells supported by the base station 105 or for cells for which the base station 105 has pre-emption information. At block 315, the base station 105 may form an indication of the availability of preemption information that provides per-carrier information on whether to preempt non-URLLC traffic. In some aspects, the indication includes a carrier index value and a preemption indicator. In other aspects, the ordering/arrangement of carrier index values may be configured separately and not explicitly signaled.

Based on each carrier for which preemption information is indicated as available, base station 105 forms a variable size preemption information payload. At block 320, using the implicit or explicit carrier index value, the base station 105 sends one or more control messages 325 to the UE 115, the one or more control messages 325 including an indication of availability for multiple carriers, and Variable-size preempts information. In some aspects, the control message(s) may be sent on a downlink control channel, such as the PDCCH. In some aspects, the indication of availability may be sent separately from the variable-size preemption information (eg, a separate control message). For example, when sent separately, a first encoding may be applied to control messages carrying an indication of availability, and a second encoding may be applied to control messages carrying variable-sized preemption information. This may be advantageous to provide greater reliability for the indication while utilizing resource efficiency for a potentially larger payload of preemptive information. For example, the first encoding may provide greater redundancy than the second encoding.

4 illustrates aspects of an exemplary communication system 400 that provides multi-carrier preemption information in accordance with the present disclosure. As shown, the base station 105 provides a primary cell (Y0) for multiple UEs in the coverage area of the base station 105 . As shown, secondary cells Y1, Y2, Y3, and Y4 exist and can provide additional bandwidth when configured as a secondary carrier for each UE (with Y0 as its primary carrier). In this example, primary cell Y0 carries preemption information for five carriers Y0-Y4 by control message 405 . Control message 405 has index field 410 and variable size preemption information 415 .

The exemplary 5-bit index field 410 of the control message 405 provides an indication of the availability of preemption information for each carrier in the set of carriers including Y0-Y4. Here, "1" indicates that the preemptive information in the variable-size preemptive information 415 is available, and "0" indicates that it is not available. The index field 410 may be of fixed size, with each bit corresponding to a different carrier in the plurality of carriers Y0-Y4. Because different UEs may be configured with different ones of subcarriers Y1-Y4, the UE-based carrier index corresponding to cells Y1-Y4 may be different for different UEs in this example. In some aspects, base station 105 provides a mapping of carriers to bits of index field 410, and UEs 115 use the mapping to identify which of the UEs 115's scheduled carriers is indicated as having preemption information. Information for mapping may be provided in device configuration (eg, RRC signaling) or through broadcast messages (eg, system information or other overhead signaling).

As mentioned above, variable size preemption information 415 may be the second field of control message 405, or it may be sent in a separate control message. Within variable size preemption information 415, the location of the preemption information for a carrier of the plurality of carriers Y0-Y4 may vary based on the subset of carriers that the preemption information indicates in index field 410 as available. The amount of preemption information may also vary according to the number of carriers in the plurality of carriers Y0-Y4 for which preemption information is indicated as available. In this example, the bits of the index field 410 corresponding to cells Y2 and Y4 are set to "1" to indicate that preemption information is available for these carriers. The remaining bits of the index field 410 are set to "0", indicating that no preemption information is available for the corresponding carrier.

Continuing with the illustrated example, the variable-size preemption information 415 includes 14-bit information elements 415a, 415b that correspond to the subsets of carriers Y2, Y4 that the preemption information indicates as available by the index field 410. These 14-bit elements may indicate which resources on the corresponding carrier are preempted for use by URLLC or other high priority traffic. For example, these 14 bits may represent the RB index on the shared channel that is affected by preemption. Advantageously, with this arrangement, preemption information 415 is transmitted only for carriers that are indicated to have preemption information available. In this way, while a significant reduction in the message size of the control message 405 can be achieved, the preemption information 415 in the control message 405 remains identifiable for the corresponding carriers Y2, Y4. For example, instead of sending 5*14=60 bits of preemptive information, only 14*2=28 bits are required for the variable size preemption information 415 disclosed herein.

Returning to the discussion of FIG. 3 , the multi-carrier control message sent by the base station 105 at block 320 may be as described for the example control message 405 . In some aspects, the multi-carrier control message is a group common control message available for use by multiple user equipment devices. The group common control messages may include group-based downlink control information (DCI) messages, which may be scrambled, eg, by a group identifier, and sent in a common search space monitored by the intended group of UEs.

At block 330, UE 115 receives a multi-carrier control message with variable size preemption information from base station 105, and at block 340, UE 115 determines resource allocations for its configured component carriers. In some aspects, determining resource allocations may include receiving dynamic grants or utilizing semi-static resource allocations. For example, UE 115 may determine which component carriers in its carrier aggregation configuration are scheduled to send or receive data transmissions on a shared channel in a particular time slot or subframe. Then, based on the indication of availability of preemption information from the multi-carrier control message (eg, index field 410), UE 115 may determine whether one or more of its scheduled carriers are subject to preemption. In one aspect, if it is determined that preemption information is available for a scheduled carrier, the UE 115 may compare its scheduled resources (from block 335) with the preemption information corresponding to each scheduled carrier from the multicarrier control message (eg, may The variable size preempts information 415) for comparison.

At block 340, the UE 115 attempts to decode the data transmission on its scheduled carrier(s). Decoding may be based on the results of comparing its scheduled resources with preempted resources as indicated previously. Depending on the result of the comparison, the UE 115 may decode normally (with the expectation of an error), or it may avoid decoding the pre-empted resource. Attempting to decode preemptive resources may be undesirable and may have a negative impact on HARQ operation. At signal 345, UE 115 sends ACK/NACK feedback based on the decoded results. In some aspects, ACK/NACK feedback may include finer-grained code block (CB) level feedback such that UE 115 requests retransmission of only a portion of the scheduled resources affected by preemption. In this way, the efficiency of the wireless communication system is increased while also reducing the size of messages required to support service multiplexing.

5 illustrates a block diagram of a device 500 supporting preemption-based multiplexing in accordance with aspects of the present disclosure. Device 500 may be an example of an implementation of UE 115 and may include various components in communication via one or more buses 544, including one of processor 512, memory 516, and transceiver 502 or many. These elements may operate in conjunction with modem 540 and indication component 550 to implement one or more of the functions described herein in connection with the use of multi-carrier preemption information. Additionally, one or more processors 512, modems 540, memory 516, transceivers 502, RF front ends 588, and one or more antennas 565 may be configured to support voice and/or in one or more radio access technologies or data calls (simultaneous or non-simultaneous).

In one aspect, the one or more processors 512 may include a modem 540 using one or more modem processors. Various functions related to indication component 550 may be included in modem 540 and/or processor 512 . In one aspect, various functions may be performed by a single processor 512 in combination with other elements, while in other aspects different ones of the various functions may be performed by a combination of two or more different processors 512 . For example, in one aspect, the one or more processors 512 may include any one or any combination of the following: a modem processor, or a baseband processor, or a digital signal processor, or a transmit processor, or a receive processor, or an associated A transceiver processor for transceiver 502. In other aspects, some of the features of one or more processors 512 and/or modem 540 associated with indicating component 550 may be performed by transceiver 502 .

In one aspect, indicating component 550 can support preemption of resources between different traffic types. As shown, the indicating component 550 may include a receiving component 552, a pre-empting component 554, a decoding component 556, and an encoding component 560. Decoding component 556 may include an LLR buffer (soft buffer) 558 for storing log-likelihood ratios related to HARQ operations. In one example, receiving component 552 can receive, via transceiver 502, downlink control information (DCI) messages, including resource grants and control messages with multi-carrier preemption information. In the event that none of the scheduled carriers of UE 115 is affected by preemption, encoding component 560 and decoding component 556 can perform normally and can operate to encode signals for uplink transmissions or to encode signals for downlink transmissions, respectively. The received signal in the link transmission is decoded.

When receiving component 552 receives the DCI message with multi-carrier preemption information, preemption component 554 can determine whether the preemption information is indicated as available for at least one carrier on which UE 115 is scheduled to send or receive data transmissions. If the preemption information is available, the preemption component 554 can obtain the preemption information from the DCI message and compare the preemption information to the scheduled resources on the affected carrier or carriers. A DCI message may be described differently herein, and in particular it may contain variable size preemption information. Based on the results of the comparison, preemption component 554 can control the corresponding operations of encoding component 560 and decoding component 556. For example, preemption component 554 can determine the overlap between the scheduled resources for a given carrier and the preemptive resources signaled in the preemption information. In the event that a data transmission is received on the downlink, the preemption component 554 can cause the decoding component to avoid decoding the preempted resource, thereby avoiding corrupting the contents of the LLR buffer 558 . In the case of sending an uplink transmission, preemption component 554 can cause the encoding component to avoid using preemptive resources when sending data transmissions on the uplink. Such preemption management may involve dropping or abandoning transmissions, or adjusting the rate matching behavior of the UE 115 to account for lost resources, and may involve any combination of the features described herein.

The memory 516 may be configured to store a local version of the data and/or application 575 used herein, or one or more of the instruction component 550 and/or its subcomponents executed by the at least one processor 512 . Memory 516 may include any type of computer-readable medium that can be used by a computer or at least one processor 512, such as random access memory (RAM), read only memory (ROM), magnetic disk, optical disk, volatile memory, non-volatile memory volatile memory, and any combination thereof. In an aspect, for example, when the UE 115 is operating with the at least one processor 512 to execute one or more of the indicating component 550 and/or its subcomponents, the memory 516 may be the storage definition indicating component 550 and/or A non-transitory computer-readable storage medium of one or more computer-executable code and/or data associated therewith for one or more of its subcomponents. In general, memory 516 can store instructions and data that can be used by one or more of processors 512 (including modem 540 ) to control the operation of UE 115 as described herein, including algorithms that perform various algorithms and functions step.

The transceiver 502 may include at least one receiver 506 and at least one transmitter 508 . Receiver 506 may include hardware, firmware, and/or software code executable by a processor, including instructions, stored in memory (eg, a computer-readable medium) for receiving data. Receiver 506 may be, for example, a radio frequency (RF) receiver. In an aspect, receiver 506 may receive signals transmitted by at least one base station 105 . Additionally, receiver 506 may process such received signals, and may also obtain measurements on these signals, such as, but not limited to, Ec/Io, SNR, RSRP, RSSI, and the like. Transmitter 508 may include hardware, firmware, and/or software code executable by a processor for transmitting data, the code including instructions and stored in memory (eg, a computer-readable medium). Suitable examples of transmitter 508 may include, but are not limited to, RF transmitters.

Also, in one aspect, the UE 115 may include an RF front end 588 operatively operative in communication with the one or more antennas 565 and the transceiver 502 for receiving and transmitting radio signals, such as wireless communications transmitted by at least one base station 105 or Wireless transmissions transmitted by UE 115 . RF front end 588 may be connected to one or more antennas 565 and may include one or more low noise amplifiers (LNAs) 590, one or more switches 592, one or more power amplifiers ( PA) 598, and one or more filters 596.

In one aspect, the LNA 590 can amplify the received signal to achieve the desired output level. In one aspect, each LNA 590 may have specified minimum and maximum gain values. In one aspect, the RF front end 588 may use one or more switches 592 to select a particular LNA 590 and its assigned gain value based on the desired gain for a particular application.

Additionally, for example, one or more PAs 598 may be used by the RF front end 588 to amplify the signal to obtain an RF output at a desired output power level. In one aspect, each PA 898 may have specified minimum and maximum gain values. In one aspect, the RF front end 588 may use one or more switches 592 to select a particular PA 598 and its assigned gain value based on the desired gain value for the particular application.

One or more filters 596 may also be used as part of the RF front end 588 to filter the received signal to obtain the input RF signal. Similarly, in one aspect, respective filters 596 may be used to filter outputs from respective PAs 598 to generate output signals for transmission. In one aspect, each filter 596 may be connected to a specific LNA 590 and/or PA 598. In one aspect, RF front end 588 may use one or more switches 592 to select transmission or reception using specified filters 596 , LNA 590 , and/or PA 598 based on the configuration as specified by transceiver 502 and/or processor 512 path.

Transceiver 502 may be configured to transmit and receive wireless signals through one or more antennas 565 via RF front end 588 . In one aspect, the transceiver 502 may be tuned to operate at a designated frequency such that the UE 115 may communicate with, for example, one or more base stations 105 or one or more cells associated with the one or more base stations 105 . In one aspect, for example, modem 540 may configure transceiver 502 to operate at a specified frequency and power level based on the UE configuration of UE 115 and the communication protocol used by modem 540 .

In one aspect, modem 540 can be a multi-band-multi-mode modem that can process digital data and communicate with transceiver 502 such that transceiver 502 is used to transmit and receive digital data. In one aspect, modem 540 may be multi-band and configured to support multiple frequency bands for a particular communication protocol, such as a communication protocol supporting carrier aggregation. In one aspect, modem 540 may be multi-mode and configured to support multiple radio access technologies and communication protocols. In one aspect, modem 540 may control one or more components of UE 115 (eg, RF front end 588, transceiver 502) to enable transmission and/or reception of signals from the network based on a specified modem configuration. In one aspect, the modem configuration may be based on the mode of operation of the modem 540 and the frequency band used. In another aspect, the modem configuration may be based on UE configuration information associated with UE 115, as provided by the network during cell selection and/or cell reselection.

6 illustrates a method 600 for wireless communication in accordance with aspects of the present disclosure. The operations of method 600 may be implemented by UE 115 or components thereof as described herein. For example, the operations of method 600 may be performed by one or more of processor 512, memory 516, modem 540, and transceiver 502 as described with reference to the structure of FIG. 5, and may encompass those discussed in connection with FIGS. 1-4. any of the different aspects or combinations of features described. In some examples, UE 115 may execute a code set to control various structural elements of the device to perform the functions described below. Additionally or alternatively, the UE 115 may use dedicated hardware to perform various aspects of the functions described below.

At block 610, the UE may receive a control message in a downlink control channel, the control message including an indication of the availability of preemption information for multiple carriers. In some aspects, the control messages may be dedicated control messages. In other aspects, the control message may be a group common control message intended for a group of UEs served by the base station. The plurality of carriers for which an indication of availability is provided may include one or more carriers that form part of the UE's carrier aggregation configuration and one or more carriers that are not configured for use by the UE. In some cases, control messages are transmitted on the UE's PCC and provide preemption information for the PCC and one or more SCCs. In other cases, control messages may be received on the SCC and may provide multi-carrier preemption information for one or more SCCs.

At block 620, the UE determines whether the plurality of carriers includes at least one carrier on which the UE is scheduled to send or receive data transmissions. For a given slot or subframe, this may include determining scheduling information for each of the UE's configured component carriers, and comparing the set of scheduled component carriers with an indication of availability in a control message Compare. In one aspect, determining whether the plurality of carriers includes at least one carrier on which the UE is scheduled to send or receive data transmissions involves bits of a control message including an indication of the availability of preemption information and bits in the UE's carrier aggregation configuration. Corresponding to the mapping or association between carrier indices. For example, the ordering or arrangement of carriers Y0-Y4 in index field 410 as described in connection with FIG. 4 may be signaled to the UE as part of a dedicated (RRC) configuration, or it may be broadcast in system information by the serving base station . The UE may then map or associate the carriers of index field 410 with corresponding ones of the UE-configured carriers to facilitate use of the indication of availability in determining at least one scheduled carrier that may be affected by preemption. This mapping or association may be particularly useful when the control messages are group common control messages.

At block 630, the UE identifies preemption information for the at least one carrier in the variable size preemption information based on the subset of carriers in the plurality of carriers for which the preemption information is indicated as available. In one aspect, the control message includes a first field providing an indication of availability for multiple carriers and a second field providing variable size preemption information. The first field and the second field may be encoded differently, and in some aspects, they may be communicated separately (eg, a single control message with different encoded fields, or different control messages conveying different fields and possibly subject to different encodings) ). The UE may identify a subset of carriers indicated as having preemption information among the plurality of carriers, may identify the UE's at least one scheduled carrier from the carrier subset, and may be in the carrier subset according to the UE's at least one scheduled carrier to access the corresponding preemption information in the variable-size field. Some aspects of this identification can be appreciated with reference to FIG. 4, where the UE uses the index field 410 to identify the subset of carriers (Y2, Y4) for which preemption information is available, and then in variable size based on the ordering of the carriers in that subset of carriers The corresponding preemption information is accessed in the preemption information field 415 .

Then, at block 640, the UE communicates with the base station on at least one carrier based on the resources for the scheduled data transmission and based on the pre-emption information. For uplink data transmission, this may involve avoiding the use of some or all shared channel resources and changing rate matching behavior based on resources that are not preempted in the allocation. For downlink data reception, this may involve discarding pre-empted resources and sending appropriate HARQ feedback. Additional details and combinations of features that may be utilized with method 600 are provided in the descriptions of the other figures herein.

7 illustrates a block diagram of a device 700 supporting preemption-based multiplexing in accordance with aspects of the present disclosure. Apparatus 700 may be an example of an implementation of base station 105 and may include various components, some of which have been described above. Specifically, transceiver 702, receiver 706, transmitter 708, one or more processors 712, memory 716, application 775, bus 744, RF front end 788, LNA 790, switch 792, filter 796, PA 798, And one or more antennas 765 may be the same or similar to corresponding components of UE 115 as described above in connection with FIG. 5, but may be configured or otherwise programmed for base station operation rather than UE operation.

As with UE 115, various elements of base station 105 may operate in conjunction with modem 760 and multiplexing component 770 to implement one or more of the functions described herein with respect to preemption signaling. As shown, multiplexing component 770 may include punching component 772 , preempting information component 774 , and transmitting component 776 .

In some aspects, modem 760 and/or processor 712 may schedule a group of user equipment devices to send or receive data transmissions. As previously discussed, shared channel resources may be allocated for use by different UEs, and scheduling may involve sending control information indicating the allocated resources. When high priority data, such as URLLC data, is detected, scheduling may need to be preempted to meet latency and reliability requirements associated with the high priority data. In some aspects, multiplexing component 770 operates to manage multiplexing of different traffic types and provide preemption information to UEs.

When high priority data is detected, modem 760 and/or processor 712 may first determine the carrier and corresponding uplink or downlink resources on which the high priority data should be communicated. These resources may overlap with existing assignments on the shared data channel. The puncturing component 772 can be configured to puncture the overlapping shared channel resources to accommodate high priority transmissions. For example, existing eMBB allocations can be punctured with URLLC data as previously described. Preemption information (PI) component 774 can generate a control message with multi-carrier preemption information as described herein that identifies carriers and resources affected by operation of puncturing component 772 . 4 provides an example of a control message 405 with multi-carrier pre-emption information that may be generated by operation of multiplexing component 770 or more generally by device 700 by operation of processor 712 and related components.

The transmitting component 776 can be configured to transmit control messages to one or more UEs. In some aspects, the control message is a dedicated control message, which may be scrambled or otherwise directed to its intended recipient, eg, by the UE's identifier. In other aspects, the control message is a group common control message intended for use by a group of UEs that may be affected by preemption. As previously discussed, the indication of availability of preemptive information and the variable-sized preemptive information may be placed in different control messages and/or may be encoded differently. The transmitting component 776 can also be configured to signal a mapping or association between bits of the control message that include an indication of availability and carrier identifiers. As previously discussed, such mapping or association may assist each UE in identifying which of its configured carriers has preemption information, and how to then identify this preemption information in a variable-size preemption information payload.

8 illustrates a method 800 for wireless communication in accordance with aspects of the present disclosure. The operations of method 800 may be implemented by base station 105 or components thereof as described herein. For example, the operations of method 800 may be performed by one or more of processor 712, memory 716, modem 740, and transceiver 702 as described with reference to FIGS. 5 and 7, and may encompass the processes described in FIGS. 1-4. any combination of the described features. In some examples, base station 105 may execute a code set to control various structural elements of the device to perform the functions described below. Additionally or alternatively, base station 105 may use dedicated hardware to perform various aspects of the functions described below.

At block 810, the base station 105 may identify one or more carriers of the plurality of carriers for which preemption information is available. For example, in a given time slot or subframe for each of the multiple carriers, the base station may determine to send or receive high priority data transmissions to or from the user equipment. High priority data transmissions may use resources that overlap with resources scheduled for lower priority transmissions, creating a need to notify scheduled users of preemptive resources. For example, portions of currently scheduled or ongoing eMBB transmissions may be reassigned to URLLC traffic.

At block 820, the base station 105 may generate an indication of the availability of preemption information for each of the plurality of carriers based on the corresponding index value for that carrier. The indication of availability may include a fixed size field, different bits of the fixed size field corresponding to different ones of the plurality of carriers, and wherein the different carriers are in a manner related to the placement of the corresponding preemption information in the variable size preemption information field to sort/arrange/index. In one example, the indication of availability may signal the subset of carriers for which preemption information is available, and the ordering of carriers within the subset of carriers may determine the arrangement of variable size preemption information. In this manner, the location of preemption information for a carrier of the plurality of carriers may vary based on the subset of carriers for which the preemption information is indicated as available. Likewise, the size of the pre-emptive information will vary, resulting in a more efficient use of air link resources.

At block 830, the base station generates a control message including a multi-carrier indication of availability of pre-emption information and variable-sized pre-emption information, wherein the pre-emption information for a carrier of the plurality of carriers is variable-sized based on the indication The preemption information is identifiable. At block 840, the base station transmits a control message to a group of user equipment devices on a downlink control channel.

It should be noted that the above methods describe possible implementations and that various operations and steps may be rearranged or otherwise modified and that other implementations are possible. Furthermore, aspects from two or more approaches can be combined.

The techniques described herein may be used in various wireless communication systems such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-Carrier Frequency Division Multiple Access (SC-FDMA) and other systems. A CDMA system may implement radio technologies such as CDMA2000, Universal Terrestrial Radio Access (UTRA). CDMA2000 covers IS-2000, IS-95 and IS-856 standards. IS-2000 versions may generally be referred to as CDMA2000 1X, 1X, etc. IS-856 (TIA-856) is commonly referred to as CDMA2000 1xEV-DO, High Rate Packet Data (HRPD), and the like. UTRA includes Wideband CDMA (WCDMA) and other variants of CDMA. A TDMA system may implement a radio technology such as Global System for Mobile Communications (GSM).

OFDMA systems can implement radios such as Ultra Mobile Broadband (UMB), Evolved UTRA (E-UTRA), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, etc. technology. UTRA and E-UTRA are part of the Universal Mobile Telecommunications System (UMTS). LTE and LTE-A are releases of UMTS that use E-UTRA. UTRA, E-UTRA, UMTS, LTE, LTE-A, NR and GSM are described in documents from an organization named "3rd Generation Partnership Project" (3GPP). CDMA2000 and UMB are described in documents from an organization named "3rd Generation Partnership Project 2" (3GPP2). The techniques described herein may be used for both the systems and radio technologies mentioned above, as well as for other systems and radio technologies. Although aspects of an LTE or NR system may be described for example purposes, and LTE or NR terminology may be used in much of the description, the techniques described herein may also apply to applications other than LTE or NR applications.

A macro cell typically covers a relatively large geographic area (eg, an area with a radius of several kilometers) and may allow unrestricted access by UEs 115 that have a service subscription with the network provider. Small cells may be associated with lower power base stations 105 (compared to macro cells), and small cells may operate in the same or a different (eg, licensed, unlicensed, etc.) frequency band than the macro cells . According to various examples, small cells may include pico cells, femto cells, and micro cells. A picocell may, for example, cover a small geographic area and allow unrestricted access by UEs 115 that have a service subscription with a network provider. A femtocell may also cover a smaller geographic area (eg, a residence) and may provide restricted access by UEs 115 associated with the femtocell (eg, UEs 115 in a Closed Subscriber Group (CSG), residential user's UE 115, etc.) access. An eNB for a macro cell may be referred to as a macro eNB. eNBs for small cells may be referred to as small cell eNBs, pico eNBs, femto eNBs, or home eNBs. An eNB may support one or more (eg, two, three, four, etc.) cells and may also support communication using one or more component carriers.

One or more of the wireless communication systems 100 described herein may support synchronous or asynchronous operation. For synchronous operation, base stations 105 may have similar frame timing, and transmissions from different base stations 105 may be approximately aligned in time. For asynchronous operation, base stations 105 may have different frame timing, and transmissions from different base stations 105 may not be aligned in time. The techniques described herein can be used for synchronous or asynchronous operations.

The information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, the data, instructions, commands, information, signals, bits, symbols, and chips that may be referred to throughout the above description may be composed of voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof. To represent.

The various illustrative blocks and modules described in connection with the disclosure herein may be used with general purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs) designed to perform the functions described herein. ) or other programmable logic device (PLD), discrete gate or transistor logic, discrete hardware components, or any combination thereof. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices (eg, a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

The functions described herein can be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination thereof. Features implementing the functionality may also be physically located in various locations, including being distributed such that portions of the functionality are implemented at different physical locations.

Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A non-transitory storage medium can be any available medium that can be accessed by a general purpose or special purpose computer. By way of example and not limitation, non-transitory computer readable media may include random access memory (RAM), read only memory (ROM), electrically erasable programmable read only memory (EEPROM), flash memory, compact disc (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage device, or any other means which can be used to carry or store desired program code means in the form of instructions or data structures and which can be accessed by a general purpose or special purpose computer, or a general purpose or special purpose processor non-transitory medium. Any connection is properly termed a computer-readable medium. For example, if the software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then The coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included in the definition of medium. Disk and disc as used herein includes CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk, and blu-ray disc, where disks often reproduce data magnetically and discs reproduce optically with lasers data. Combinations of the above are also included within the scope of computer-readable media.

As used herein (including in the claims), "or" used in a recitation of an item (eg, a recitation of an item with a phrase such as "at least one of" or "one or more of") " indicates an inclusive recitation such that, for example, a recitation of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (ie, A and B and C). Also, as used herein, the phrase "based on" should not be read as referring to a closed set of conditions. For example, an exemplary step described as "based on condition A" may be based on both condition A and condition B without departing from the scope of this disclosure. In other words, as used herein, the phrase "based on" should be read in the same manner as the phrase "based at least in part on."

In the drawings, similar components or features may have the same reference numerals. In addition, various components of the same type may be distinguished by following the reference number with a dash and a second number that distinguishes between similar components. If only the first reference number is used in the specification, the description may apply to any one of the similar components having the same first reference number regardless of the second reference number, or other subsequent reference numbers.

The descriptions set forth herein in connection with the accompanying drawings describe example configurations and do not represent all examples that may be implemented or that fall within the scope of the claims. As used herein, the term "exemplary" means "serving as an example, instance, or illustration," and not "preferable" or "over other examples." This detailed description includes specific details for the purpose of providing an understanding of the described technology. However, these techniques may be practiced without these specific details. In some instances, well-known structures and devices are shown in block diagram form in order to avoid obscuring the concepts of the described examples.

The descriptions herein are provided to enable any person skilled in the art to make or use the present disclosure. Various modifications to this disclosure will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other modifications without departing from the scope of this disclosure. Thus, the present disclosure is not to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (43)

1. A method for wireless communication performed by a user equipment (UE), comprising: receiving a control message in a downlink control channel, the control message including an indication of the availability of preemption information for a plurality of carriers; determining whether the plurality of carriers includes at least one carrier on which the UE has scheduled data transmissions; identifying pre-emption information for the at least one carrier in variable-size pre-emption information based on a subset of carriers in the plurality of carriers for which pre-emption information is indicated as available; and A base station is communicated on the at least one carrier based on the resources for the scheduled data transmission and based on the preemption information. 2. The method of claim 1, wherein the location of the pre-emption information for the at least one carrier varies based on the subset of carriers in the plurality of carriers for which pre-emption information is indicated to be available. 3. The method of claim 1, further comprising: determining a mapping between each bit of the control message including the indication of the availability of preemption information and a corresponding carrier index in the UE's carrier aggregation configuration, wherein determining whether the plurality of carriers includes at least one carrier on which the UE is scheduled to send or receive data transmissions is based at least in part on the mapping. 4. The method of claim 1, wherein the indication of the availability of preemption information comprises a first field of the control message having a fixed size, and wherein the variable size preemption information comprises The second field of the control message has a variable size. 5. The method of claim 4, wherein the first field has a first encoding and the second field has a second encoding, the second encoding having a smaller value than the first encoding redundancy. 6. The method of claim 1, further comprising identifying, based on the pre-emption information, a subset of resources that are unavailable among the resources on which the UE is scheduled to send or receive data transmissions. 7. The method of claim 6, further comprising: Exclude the subset of resources from decoding operations performed by the UE; and HARQ feedback is sent to the base station based on the result of the decoding operation. 8. The method of claim 1, wherein the control message is common to a plurality of UEs, and wherein the amount of pre-emption information is dependent on the number of carriers in the plurality of carriers for which pre-emption information is indicated as available. Variety. 9. The method of claim 1, wherein the plurality of carriers comprises a primary component carrier and one or more secondary component carriers in a carrier aggregation configuration of the UE. 10. The method of claim 1, wherein the scheduled data transmission is an enhanced mobile broadband (eMBB) data transmission and the pre-emption information identification is reassigned for Ultra Reliable Low Latency (URLLC) ) transmitted and temporarily unavailable for the eMBB data transmission. 11. The method of claim 1, further comprising receiving a second control message in the downlink control channel, the second control message including the preemption information. 12. A method for wireless communication performed by a base station, comprising: identifying one or more carriers among the plurality of carriers for which preemption information is available; generating an indication of the availability of preemption information for each of the plurality of carriers based on a corresponding carrier index for that carrier; generating a control message including the indication of the availability of preemption information and variable size preemption information, wherein preemption information for a carrier of the plurality of carriers is The variable size preemption message is identifiable; and The control message is communicated to a group of user equipment devices on a downlink control channel. 13. The method of claim 12, wherein the location of the pre-emption information for a carrier of the plurality of carriers is based on a subset of carriers in the plurality of carriers for which pre-emption information is indicated as available. Variety. 14. The method of claim 12, wherein bits of the control message including the indication of the availability of preemption information are determined to be associated with a user equipment device of the group of user equipment devices. A mapping between corresponding carrier indices utilized, wherein generating the control message is based at least in part on the mapping. 15. The method of claim 12, wherein the indication of the availability of preemption information comprises a first field of the control message having a fixed size, and wherein the variable size preemption information comprises The second field of the control message has a variable size. 16. The method of claim 15, wherein the first field has a first encoding and the second field has a second encoding, the second encoding having a smaller value than the first encoding redundancy. 17. The method of claim 12, wherein the preemption information identifies a subset of resources that are not available for transmission or reception of data transmissions by user equipment devices of the group of user equipment devices. 18. The method of claim 12, wherein the control message is a group common control message monitored by user equipment devices of the group of user equipment devices, and wherein the amount of variable size preemption information is based on . The pre-emption information among the plurality of carriers is indicated as a function of the number of available carriers. 19. The method of claim 12, wherein at least one user equipment device of the group of user equipment devices is scheduled to receive enhanced mobile broadband (eMBB) data transmissions, and wherein the preemption information is identified by Reassign resources for Ultra Reliable Low Latency (URLLC) transmissions that are temporarily unavailable for the eMBB data transmission. 20. The method of claim 12, wherein transmitting the control message comprises transmitting a first control message with an indication of the availability of preemption information for the plurality of carriers, and transmitting a A second control message for the variable-size preemption message. 21. A user equipment (UE) comprising: means for receiving a control message in a downlink control channel, the control message including an indication of availability of preemption information for a plurality of carriers; means for determining whether the plurality of carriers includes at least one carrier on which the UE has scheduled data transmissions; means for identifying pre-emption information for the at least one carrier in variable-size pre-emption information based on a subset of carriers in the plurality of carriers for which pre-emption information is indicated as available; and Means for communicating with a base station on the at least one carrier based on resources for the scheduled data transmission and based on the preemption information. 22. The user equipment of claim 21, wherein the location of the pre-emption information for the at least one carrier varies based on the subset of carriers in the plurality of carriers for which pre-emption information is indicated as available . 23. The user equipment of claim 21, further comprising: means for determining a mapping between bits of the control message comprising the indication of the availability of preemption information and a corresponding carrier index in the UE's carrier aggregation configuration, wherein the means for determining whether the plurality of carriers includes at least one carrier on which the UE is scheduled to send or receive data transmissions can operate based at least in part on the mapping. 24. The user equipment of claim 21, wherein the indication of the availability of preemption information comprises a first field of the control message having a fixed size, and wherein the variable size preemption information A variable-sized second field of the control message is included. 25. The user equipment of claim 21, further comprising a subset of resources for identifying, based on the pre-emption information, that the UE is scheduled to send or receive data transmissions on which a subset of resources are unavailable installation. 26. An apparatus for wireless communication, comprising: processor; a memory in electronic communication with the processor; and instructions stored in the memory and operable when executed by the processor to cause the apparatus to: receiving a control message in a downlink control channel, the control message including an indication of the availability of preemption information for a plurality of carriers; determining whether the plurality of carriers includes at least one carrier on which the apparatus has scheduled data transmissions; identifying pre-emption information for the at least one carrier in variable-size pre-emption information based on a subset of carriers in the plurality of carriers for which pre-emption information is indicated as available; and A base station is communicated on the at least one carrier based on the resources for the scheduled data transmission and based on the preemption information. 27. The apparatus of claim 26, wherein the location of the pre-emption information for the at least one carrier varies based on the subset of carriers in the plurality of carriers for which pre-emption information is indicated to be available. 28. The apparatus of claim 26, wherein the instructions, when executed by the processor, are further operable to cause the apparatus to: determining a mapping between each bit of the control message including the indication of the availability of preemption information and a corresponding carrier index in the UE's carrier aggregation configuration, wherein determining whether the plurality of carriers includes at least one carrier on which the UE is scheduled to send or receive data transmissions is based at least in part on the mapping. 29. The apparatus of claim 26, wherein the indication of the availability of preemption information comprises a first field of the control message having a fixed size, and wherein the variable size preemption information comprises The second field of the control message has a variable size. 30. The apparatus of claim 26, wherein the instructions, when executed by the processor, are further operable to cause the apparatus to: identify, based on the pre-emption information, that the UE is scheduled to be The subset of resources that are not available among the resources on which data transmissions are sent or received. 31. A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to: receiving a control message in a downlink control channel, the control message including an indication of the availability of preemption information for a plurality of carriers; determining whether the plurality of carriers includes at least one carrier on which a device has scheduled data transmissions; identifying pre-emption information for the at least one carrier in variable-size pre-emption information based on a subset of carriers in the plurality of carriers for which pre-emption information is indicated as available; and A base station is communicated on the at least one carrier based on the resources for the scheduled data transmission and based on the preemption information. 32. A base station, comprising: means for identifying one or more carriers of a plurality of carriers for which preemption information is available; means for generating an indication of the availability of preemption information for each carrier in the plurality of carriers based on a corresponding carrier index for that carrier; Means for generating a control message, the control message comprising the indication of the availability of preemption information and variable size preemption information, wherein preemption information for a carrier of the plurality of carriers is based on the indication is identifiable within the variable-size preemption information; and Means for transmitting the control message to a group of user equipment devices on a downlink control channel. 33. The base station of claim 32, wherein the location of the pre-emption information for a carrier of the plurality of carriers is determined based on a subset of carriers in the plurality of carriers for which pre-emption information is indicated as available. Variety. 34. The base station of claim 32, further comprising: means for determining a mapping between bits of the control message comprising the indication of the availability of preemption information and corresponding carrier indices utilized by user equipment devices of the group of user equipment devices, wherein The means for generating the control message is operable based at least in part on the mapping. 35. The base station of claim 32, wherein the indication of the availability of preemption information comprises a first field of the control message having a fixed size, and wherein the variable size preemption information comprises The second field of the control message has a variable size. 36. The base station of claim 32, wherein the preemption information identifies a subset of resources that are unavailable for transmission or reception of data transmissions by user equipment devices in the group of user equipment devices. 37. The base station of claim 32, wherein the control message is a group common control message monitored by user equipment devices in the group of user equipment devices, and wherein the amount of variable size preemption information is based on The pre-emption information among the plurality of carriers is indicated as a function of the number of available carriers. 38. An apparatus for wireless communication, comprising: processor; a memory in electronic communication with the processor; and instructions stored in the memory and operable when executed by the processor to cause the apparatus to: identifying one or more carriers among the plurality of carriers for which preemption information is available; generating an indication of the availability of preemption information for each of the plurality of carriers based on a corresponding carrier index for that carrier; generating a control message including the indication of the availability of preemption information and variable size preemption information, wherein preemption information for a carrier of the plurality of carriers is The variable size preemption message is identifiable; and The control message is communicated to a group of user equipment devices on a downlink control channel. 39. The apparatus of claim 38, wherein the location of the preemption information for a carrier of the plurality of carriers is determined based on a subset of carriers in the plurality of carriers for which preemption information is indicated as available. Variety. 40. The apparatus of claim 38, wherein the instructions, when executed by the processor, are further operable to cause the apparatus to: determine the availability of the control message including preemption information A mapping between bits of the indication and corresponding carrier indices utilized by user equipment devices of the group of user equipment devices, wherein generating the control message is based at least in part on the mapping. 41. The apparatus of claim 38, wherein the indication of the availability of preemption information comprises a first field of the control message having a fixed size, and wherein the variable size preemption information comprises The second field of the control message has a variable size. 42. The apparatus of claim 38, wherein the control message is a group common control message monitored by user equipment devices of the group of user equipment devices, and wherein the amount of variable size preemption information is based on The pre-emption information among the plurality of carriers is indicated as a function of the number of available carriers. 43. A non-transitory computer-readable medium storing code for wireless communication, the code comprising instructions executable by a processor to: identifying one or more carriers among the plurality of carriers for which preemption information is available; generating an indication of the availability of preemption information for each of the plurality of carriers based on a corresponding carrier index for that carrier; generating a control message including the indication of the availability of preemption information and variable size preemption information, wherein preemption information for a carrier of the plurality of carriers is The variable size preemption message is identifiable; and The control message is communicated to a group of user equipment devices on a downlink control channel.

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